﻿using System;
using System.Collections;
using System.Collections.Specialized;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Data.Common;
using System.Collections.Generic;

public class DbHelperSQL
{
    //数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库.		
    public static string connectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
    public DbHelperSQL() { }

    #region 公用方法
    /// <summary>
    /// 判断是否存在某表的某个字段
    /// </summary>
    /// <param name="tableName">表名称</param>
    /// <param name="columnName">列名称</param>
    /// <returns>是否存在</returns>
    public static bool ColumnExists(string tableName, string columnName)
    {
        string sql = "select count(1) from syscolumns where [id]=object_id('" + tableName + "') and [name]='" + columnName + "'";
        object res = GetSingle(sql);
        if (res == null)
        {
            return false;
        }
        return Convert.ToInt32(res) > 0;
    }
    public static int GetMinID(string FieldName, string TableName)
    {
        string strsql = "select min(" + FieldName + ") from " + TableName;
        object obj = DbHelperSQL.GetSingle(strsql);
        if (obj == null)
        {
            return 0;
        }
        else
        {
            return int.Parse(obj.ToString());
        }
    }
    public static int GetMaxID(string FieldName, string TableName)
    {
        string strsql = "select max(" + FieldName + ")+1 from " + TableName;
        object obj = DbHelperSQL.GetSingle(strsql);
        if (obj == null)
        {
            return 1;
        }
        else
        {
            return int.Parse(obj.ToString());
        }
    }
    public static bool Exists(string strSql)
    {
        object obj = DbHelperSQL.GetSingle(strSql);
        int cmdresult;
        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
        {
            cmdresult = 0;
        }
        else
        {
            cmdresult = int.Parse(obj.ToString());
        }
        if (cmdresult == 0)
        {
            return false;
        }
        else
        {
            return true;
        }
    }
    /// <summary>
    /// 表是否存在
    /// </summary>
    /// <param name="TableName"></param>
    /// <returns></returns>
    public static bool TabExists(string TableName)
    {
        string strsql = "select count(*) from sysobjects where id = object_id(N'[" + TableName + "]') and OBJECTPROPERTY(id, N'IsUserTable') = 1";
        //string strsql = "SELECT count(*) FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[" + TableName + "]') AND type in (N'U')";
        object obj = DbHelperSQL.GetSingle(strsql);
        int cmdresult;
        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
        {
            cmdresult = 0;
        }
        else
        {
            cmdresult = int.Parse(obj.ToString());
        }
        if (cmdresult == 0)
        {
            return false;
        }
        else
        {
            return true;
        }
    }
    public static bool Exists(string strSql, params SqlParameter[] cmdParms)
    {
        object obj = DbHelperSQL.GetSingle(strSql, cmdParms);
        int cmdresult;
        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
        {
            cmdresult = 0;
        }
        else
        {
            cmdresult = int.Parse(obj.ToString());
        }
        if (cmdresult == 0)
        {
            return false;
        }
        else
        {
            return true;
        }
    }
    #endregion

    #region  执行简单SQL语句

    /// <summary>
    /// 执行SQL语句，返回影响的记录数
    /// </summary>
    /// <param name="SQLString">SQL语句</param>
    /// <returns>影响的记录数</returns>
    public static int ExecuteSql(string SQLString)
    {
        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            using (SqlCommand cmd = new SqlCommand(SQLString, connection))
            {
                try
                {
                    connection.Open();
                    int rows = cmd.ExecuteNonQuery();
                    return rows;
                }
                catch (System.Data.SqlClient.SqlException e)
                {
                    connection.Close();
                    throw e;
                }
            }
        }
    }

    /// <summary>
    /// 2012-2-21新增重载，执行SQL语句，返回影响的记录数
    /// </summary>
    /// <param name="connection">SqlConnection对象</param>
    /// <param name="trans">SqlTransaction事件</param>
    /// <param name="SQLString">SQL语句</param>
    /// <returns>影响的记录数</returns>
    public static int ExecuteSql(SqlConnection connection, SqlTransaction trans, string SQLString)
    {
        using (SqlCommand cmd = new SqlCommand(SQLString, connection))
        {
            try
            {
                cmd.Connection = connection;
                cmd.Transaction = trans;
                int rows = cmd.ExecuteNonQuery();
                return rows;
            }
            catch (System.Data.SqlClient.SqlException e)
            {
                //trans.Rollback();
                throw e;
            }
        }
    }

    public static int ExecuteSqlByTime(string SQLString, int Times)
    {
        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            using (SqlCommand cmd = new SqlCommand(SQLString, connection))
            {
                try
                {
                    connection.Open();
                    cmd.CommandTimeout = Times;
                    int rows = cmd.ExecuteNonQuery();
                    return rows;
                }
                catch (System.Data.SqlClient.SqlException e)
                {
                    connection.Close();
                    throw e;
                }
            }
        }
    }

    /// <summary>
    /// 执行Sql和Oracle滴混合事务
    /// </summary>
    /// <param name="list">SQL命令行列表</param>
    /// <param name="oracleCmdSqlList">Oracle命令行列表</param>
    /// <returns>执行结果 0-由于SQL造成事务失败 -1 由于Oracle造成事务失败 1-整体事务执行成功</returns>
    public static int ExecuteSqlTran(List<CommandInfo> list, List<CommandInfo> oracleCmdSqlList)
    {
        using (SqlConnection conn = new SqlConnection(connectionString))
        {
            conn.Open();
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = conn;
            SqlTransaction tx = conn.BeginTransaction();
            cmd.Transaction = tx;
            try
            {
                foreach (CommandInfo myDE in list)
                {
                    string cmdText = myDE.CommandText;
                    SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters;
                    PrepareCommand(cmd, conn, tx, cmdText, cmdParms);
                    if (myDE.EffentNextType == EffentNextType.SolicitationEvent)
                    {
                        if (myDE.CommandText.ToLower().IndexOf("count(") == -1)
                        {
                            tx.Rollback();
                            throw new Exception("违背要求" + myDE.CommandText + "必须符合select count(..的格式");
                            //return 0;
                        }

                        object obj = cmd.ExecuteScalar();
                        bool isHave = false;
                        if (obj == null && obj == DBNull.Value)
                        {
                            isHave = false;
                        }
                        isHave = Convert.ToInt32(obj) > 0;
                        if (isHave)
                        {
                            //引发事件
                            myDE.OnSolicitationEvent();
                        }
                    }
                    if (myDE.EffentNextType == EffentNextType.WhenHaveContine || myDE.EffentNextType == EffentNextType.WhenNoHaveContine)
                    {
                        if (myDE.CommandText.ToLower().IndexOf("count(") == -1)
                        {
                            tx.Rollback();
                            throw new Exception("SQL:违背要求" + myDE.CommandText + "必须符合select count(..的格式");
                            //return 0;
                        }

                        object obj = cmd.ExecuteScalar();
                        bool isHave = false;
                        if (obj == null && obj == DBNull.Value)
                        {
                            isHave = false;
                        }
                        isHave = Convert.ToInt32(obj) > 0;

                        if (myDE.EffentNextType == EffentNextType.WhenHaveContine && !isHave)
                        {
                            tx.Rollback();
                            throw new Exception("SQL:违背要求" + myDE.CommandText + "返回值必须大于0");
                            //return 0;
                        }
                        if (myDE.EffentNextType == EffentNextType.WhenNoHaveContine && isHave)
                        {
                            tx.Rollback();
                            throw new Exception("SQL:违背要求" + myDE.CommandText + "返回值必须等于0");
                            //return 0;
                        }
                        continue;
                    }
                    int val = cmd.ExecuteNonQuery();
                    if (myDE.EffentNextType == EffentNextType.ExcuteEffectRows && val == 0)
                    {
                        tx.Rollback();
                        throw new Exception("SQL:违背要求" + myDE.CommandText + "必须有影响行");
                        //return 0;
                    }
                    cmd.Parameters.Clear();
                }
                //string oraConnectionString = PubConstant.GetConnectionString("ConnectionStringPPC");
                //bool res = OracleHelper.ExecuteSqlTran(oraConnectionString, oracleCmdSqlList);
                //if (!res)
                //{
                //    tx.Rollback();
                //    throw new Exception("Oracle执行失败");
                // return -1;
                //}
                tx.Commit();
                return 1;
            }
            catch (System.Data.SqlClient.SqlException e)
            {
                tx.Rollback();
                throw e;
            }
            catch (Exception e)
            {
                tx.Rollback();
                throw e;
            }
        }
    }
    /// <summary>
    /// 执行多条SQL语句，实现数据库事务。
    /// </summary>
    /// <param name="SQLStringList">多条SQL语句</param>		
    public static int ExecuteSqlTran(List<String> SQLStringList)
    {
        using (SqlConnection conn = new SqlConnection(connectionString))
        {
            conn.Open();
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = conn;
            SqlTransaction tx = conn.BeginTransaction();
            cmd.Transaction = tx;
            try
            {
                int count = 0;
                for (int n = 0; n < SQLStringList.Count; n++)
                {
                    string strsql = SQLStringList[n];
                    if (strsql.Trim().Length > 1)
                    {
                        cmd.CommandText = strsql;
                        count += cmd.ExecuteNonQuery();
                    }
                }
                tx.Commit();
                return count;
            }
            catch
            {
                tx.Rollback();
                return 0;
            }
        }
    }
    /// <summary>
    /// 执行带一个存储过程参数的的SQL语句。
    /// </summary>
    /// <param name="SQLString">SQL语句</param>
    /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
    /// <returns>影响的记录数</returns>
    public static int ExecuteSql(string SQLString, string content)
    {
        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            SqlCommand cmd = new SqlCommand(SQLString, connection);
            System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@content", SqlDbType.NText);
            myParameter.Value = content;
            cmd.Parameters.Add(myParameter);
            try
            {
                connection.Open();
                int rows = cmd.ExecuteNonQuery();
                return rows;
            }
            catch (System.Data.SqlClient.SqlException e)
            {
                throw e;
            }
            finally
            {
                cmd.Dispose();
                connection.Close();
            }
        }
    }
    /// <summary>
    /// 执行带一个存储过程参数的的SQL语句。
    /// </summary>
    /// <param name="SQLString">SQL语句</param>
    /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
    /// <returns>影响的记录数</returns>
    public static object ExecuteSqlGet(string SQLString, string content)
    {
        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            SqlCommand cmd = new SqlCommand(SQLString, connection);
            System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@content", SqlDbType.NText);
            myParameter.Value = content;
            cmd.Parameters.Add(myParameter);
            try
            {
                connection.Open();
                object obj = cmd.ExecuteScalar();
                if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                {
                    return null;
                }
                else
                {
                    return obj;
                }
            }
            catch (System.Data.SqlClient.SqlException e)
            {
                throw e;
            }
            finally
            {
                cmd.Dispose();
                connection.Close();
            }
        }
    }
    /// <summary>
    /// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)
    /// </summary>
    /// <param name="strSQL">SQL语句</param>
    /// <param name="fs">图像字节,数据库的字段类型为image的情况</param>
    /// <returns>影响的记录数</returns>
    public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)
    {
        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            SqlCommand cmd = new SqlCommand(strSQL, connection);
            System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@fs", SqlDbType.Image);
            myParameter.Value = fs;
            cmd.Parameters.Add(myParameter);
            try
            {
                connection.Open();
                int rows = cmd.ExecuteNonQuery();
                return rows;
            }
            catch (System.Data.SqlClient.SqlException e)
            {
                throw e;
            }
            finally
            {
                cmd.Dispose();
                connection.Close();
            }
        }
    }

    /// <summary>
    /// 执行一条计算查询结果语句，返回查询结果（object）。
    /// </summary>
    /// <param name="SQLString">计算查询结果语句</param>
    /// <returns>查询结果（object）</returns>
    public static object GetSingle(string SQLString)
    {
        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            using (SqlCommand cmd = new SqlCommand(SQLString, connection))
            {
                try
                {
                    connection.Open();
                    object obj = cmd.ExecuteScalar();
                    if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                    {
                        return null;
                    }
                    else
                    {
                        return obj;
                    }
                }
                catch (System.Data.SqlClient.SqlException e)
                {
                    connection.Close();
                    throw e;
                }
            }
        }
    }
    public static object GetSingle(string SQLString, int Times)
    {
        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            using (SqlCommand cmd = new SqlCommand(SQLString, connection))
            {
                try
                {
                    connection.Open();
                    cmd.CommandTimeout = Times;
                    object obj = cmd.ExecuteScalar();
                    if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                    {
                        return null;
                    }
                    else
                    {
                        return obj;
                    }
                }
                catch (System.Data.SqlClient.SqlException e)
                {
                    connection.Close();
                    throw e;
                }
            }
        }
    }
    /// <summary>
    /// 执行查询语句，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
    /// </summary>
    /// <param name="strSQL">查询语句</param>
    /// <returns>SqlDataReader</returns>
    public static SqlDataReader ExecuteReader(string strSQL)
    {
        SqlConnection connection = new SqlConnection(connectionString);
        SqlCommand cmd = new SqlCommand(strSQL, connection);
        try
        {
            connection.Open();
            SqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            return myReader;
        }
        catch (System.Data.SqlClient.SqlException e)
        {
            throw e;
        }

    }
    /// <summary>
    /// 执行查询语句，返回DataSet
    /// </summary>
    /// <param name="SQLString">查询语句</param>
    /// <returns>DataSet</returns>
    public static DataSet Query(string SQLString)
    {

        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            DataSet ds = new DataSet();
            try
            {
                connection.Open();
                SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);
                command.Fill(ds, "ds");
            }
            catch (System.Data.SqlClient.SqlException ex)
            {
                throw new Exception(ex.Message);
            }
            return ds;
        }

    }
    public static DataSet Query(string SQLString, int Times)
    {
        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            DataSet ds = new DataSet();
            try
            {
                connection.Open();
                SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);
                command.SelectCommand.CommandTimeout = Times;
                command.Fill(ds, "ds");
            }
            catch (System.Data.SqlClient.SqlException ex)
            {
                throw new Exception(ex.Message);
            }
            return ds;
        }
    }

    /// <summary>
    /// 2012-2-21新增重载，执行查询语句，返回DataSet
    /// </summary>
    /// <param name="connection">SqlConnection对象</param>
    /// <param name="trans">SqlTransaction事务</param>
    /// <param name="SQLString">SQL语句</param>
    /// <returns>DataSet</returns>
    public static DataSet Query(SqlConnection connection, SqlTransaction trans, string SQLString)
    {
        DataSet ds = new DataSet();
        try
        {
            SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);
            command.SelectCommand.Transaction = trans;
            command.Fill(ds, "ds");
        }
        catch (System.Data.SqlClient.SqlException ex)
        {
            throw new Exception(ex.Message);
        }
        return ds;

    }


    #endregion

    #region 执行带参数的SQL语句

    /// <summary>
    /// 执行SQL语句，返回影响的记录数
    /// </summary>
    /// <param name="SQLString">SQL语句</param>
    /// <returns>影响的记录数</returns>
    public static int ExecuteSql(string SQLString, params SqlParameter[] cmdParms)
    {
        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            using (SqlCommand cmd = new SqlCommand())
            {
                try
                {
                    PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                    int rows = cmd.ExecuteNonQuery();
                    cmd.Parameters.Clear();
                    return rows;
                }
                catch (System.Data.SqlClient.SqlException e)
                {
                    throw e;
                }
            }
        }
    }

    /// <summary>
    /// 2012-2-29新增重载，执行SQL语句，返回影响的记录数
    /// </summary>
    /// <param name="connection">SqlConnection对象</param>
    /// <param name="trans">SqlTransaction对象</param>
    /// <param name="SQLString">SQL语句</param>
    /// <returns>影响的记录数</returns>
    public static int ExecuteSql(SqlConnection connection, SqlTransaction trans, string SQLString, params SqlParameter[] cmdParms)
    {
        using (SqlCommand cmd = new SqlCommand())
        {
            try
            {
                PrepareCommand(cmd, connection, trans, SQLString, cmdParms);
                int rows = cmd.ExecuteNonQuery();
                cmd.Parameters.Clear();
                return rows;
            }
            catch (System.Data.SqlClient.SqlException e)
            {
                //trans.Rollback();
                throw e;
            }
        }
    }

    /// <summary>
    /// 执行多条SQL语句，实现数据库事务。
    /// </summary>
    /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>
    public static void ExecuteSqlTran(Hashtable SQLStringList)
    {
        using (SqlConnection conn = new SqlConnection(connectionString))
        {
            conn.Open();
            using (SqlTransaction trans = conn.BeginTransaction())
            {
                SqlCommand cmd = new SqlCommand();
                try
                {
                    //循环
                    foreach (DictionaryEntry myDE in SQLStringList)
                    {
                        string cmdText = myDE.Key.ToString();
                        SqlParameter[] cmdParms = (SqlParameter[])myDE.Value;
                        PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                        int val = cmd.ExecuteNonQuery();
                        cmd.Parameters.Clear();
                    }
                    trans.Commit();
                }
                catch
                {
                    trans.Rollback();
                    throw;
                }
            }
        }
    }
    /// <summary>
    /// 执行多条SQL语句，实现数据库事务。
    /// </summary>
    /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>
    public static int ExecuteSqlTran(System.Collections.Generic.List<CommandInfo> cmdList)
    {
        using (SqlConnection conn = new SqlConnection(connectionString))
        {
            conn.Open();
            using (SqlTransaction trans = conn.BeginTransaction())
            {
                SqlCommand cmd = new SqlCommand();
                try
                {
                    int count = 0;
                    //循环
                    foreach (CommandInfo myDE in cmdList)
                    {
                        string cmdText = myDE.CommandText;
                        SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters;
                        PrepareCommand(cmd, conn, trans, cmdText, cmdParms);

                        if (myDE.EffentNextType == EffentNextType.WhenHaveContine || myDE.EffentNextType == EffentNextType.WhenNoHaveContine)
                        {
                            if (myDE.CommandText.ToLower().IndexOf("count(") == -1)
                            {
                                trans.Rollback();
                                return 0;
                            }

                            object obj = cmd.ExecuteScalar();
                            bool isHave = false;
                            if (obj == null && obj == DBNull.Value)
                            {
                                isHave = false;
                            }
                            isHave = Convert.ToInt32(obj) > 0;

                            if (myDE.EffentNextType == EffentNextType.WhenHaveContine && !isHave)
                            {
                                trans.Rollback();
                                return 0;
                            }
                            if (myDE.EffentNextType == EffentNextType.WhenNoHaveContine && isHave)
                            {
                                trans.Rollback();
                                return 0;
                            }
                            continue;
                        }
                        int val = cmd.ExecuteNonQuery();
                        count += val;
                        if (myDE.EffentNextType == EffentNextType.ExcuteEffectRows && val == 0)
                        {
                            trans.Rollback();
                            return 0;
                        }
                        cmd.Parameters.Clear();
                    }
                    trans.Commit();
                    return count;
                }
                catch
                {
                    trans.Rollback();
                    throw;
                }
            }
        }
    }
    /// <summary>
    /// 执行多条SQL语句，实现数据库事务。
    /// </summary>
    /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>
    public static void ExecuteSqlTranWithIndentity(System.Collections.Generic.List<CommandInfo> SQLStringList)
    {
        using (SqlConnection conn = new SqlConnection(connectionString))
        {
            conn.Open();
            using (SqlTransaction trans = conn.BeginTransaction())
            {
                SqlCommand cmd = new SqlCommand();
                try
                {
                    int indentity = 0;
                    //循环
                    foreach (CommandInfo myDE in SQLStringList)
                    {
                        string cmdText = myDE.CommandText;
                        SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters;
                        foreach (SqlParameter q in cmdParms)
                        {
                            if (q.Direction == ParameterDirection.InputOutput)
                            {
                                q.Value = indentity;
                            }
                        }
                        PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                        int val = cmd.ExecuteNonQuery();
                        foreach (SqlParameter q in cmdParms)
                        {
                            if (q.Direction == ParameterDirection.Output)
                            {
                                indentity = Convert.ToInt32(q.Value);
                            }
                        }
                        cmd.Parameters.Clear();
                    }
                    trans.Commit();
                }
                catch
                {
                    trans.Rollback();
                    throw;
                }
            }
        }
    }
    /// <summary>
    /// 执行多条SQL语句，实现数据库事务。
    /// </summary>
    /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>
    public static void ExecuteSqlTranWithIndentity(Hashtable SQLStringList)
    {
        using (SqlConnection conn = new SqlConnection(connectionString))
        {
            conn.Open();
            using (SqlTransaction trans = conn.BeginTransaction())
            {
                SqlCommand cmd = new SqlCommand();
                try
                {
                    int indentity = 0;
                    //循环
                    foreach (DictionaryEntry myDE in SQLStringList)
                    {
                        string cmdText = myDE.Key.ToString();
                        SqlParameter[] cmdParms = (SqlParameter[])myDE.Value;
                        foreach (SqlParameter q in cmdParms)
                        {
                            if (q.Direction == ParameterDirection.InputOutput)
                            {
                                q.Value = indentity;
                            }
                        }
                        PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                        int val = cmd.ExecuteNonQuery();
                        foreach (SqlParameter q in cmdParms)
                        {
                            if (q.Direction == ParameterDirection.Output)
                            {
                                indentity = Convert.ToInt32(q.Value);
                            }
                        }
                        cmd.Parameters.Clear();
                    }
                    trans.Commit();
                }
                catch
                {
                    trans.Rollback();
                    throw;
                }
            }
        }
    }
    /// <summary>
    /// 执行一条计算查询结果语句，返回查询结果（object）。
    /// </summary>
    /// <param name="SQLString">计算查询结果语句</param>
    /// <returns>查询结果（object）</returns>
    public static object GetSingle(string SQLString, params SqlParameter[] cmdParms)
    {
        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            using (SqlCommand cmd = new SqlCommand())
            {
                try
                {
                    PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                    object obj = cmd.ExecuteScalar();
                    cmd.Parameters.Clear();
                    if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                    {
                        return null;
                    }
                    else
                    {
                        return obj;
                    }
                }
                catch (System.Data.SqlClient.SqlException e)
                {
                    throw e;
                }
            }
        }
    }

    /// <summary>
    /// 2012-2-21新增重载，执行一条计算查询结果语句，返回查询结果（object）。
    /// </summary>
    /// <param name="connection">SqlConnection对象</param>
    /// <param name="trans">SqlTransaction事务</param>
    /// <param name="SQLString">计算查询结果语句</param>
    /// <returns>查询结果（object）</returns>
    public static object GetSingle(SqlConnection connection, SqlTransaction trans, string SQLString, params SqlParameter[] cmdParms)
    {
        using (SqlCommand cmd = new SqlCommand())
        {
            try
            {
                PrepareCommand(cmd, connection, trans, SQLString, cmdParms);
                object obj = cmd.ExecuteScalar();
                cmd.Parameters.Clear();
                if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                {
                    return null;
                }
                else
                {
                    return obj;
                }
            }
            catch (System.Data.SqlClient.SqlException e)
            {
                trans.Rollback();
                throw e;
            }
        }
    }

    /// <summary>
    /// 执行查询语句，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
    /// </summary>
    /// <param name="strSQL">查询语句</param>
    /// <returns>SqlDataReader</returns>
    public static SqlDataReader ExecuteReader(string SQLString, params SqlParameter[] cmdParms)
    {
        SqlConnection connection = new SqlConnection(connectionString);
        SqlCommand cmd = new SqlCommand();
        try
        {
            PrepareCommand(cmd, connection, null, SQLString, cmdParms);
            SqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            cmd.Parameters.Clear();
            return myReader;
        }
        catch (System.Data.SqlClient.SqlException e)
        {
            throw e;
        }
        //			finally
        //			{
        //				cmd.Dispose();
        //				connection.Close();
        //			}	

    }

    /// <summary>
    /// 执行查询语句，返回DataSet
    /// </summary>
    /// <param name="SQLString">查询语句</param>
    /// <returns>DataSet</returns>
    public static DataSet Query(string SQLString, params SqlParameter[] cmdParms)
    {
        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            SqlCommand cmd = new SqlCommand();
            PrepareCommand(cmd, connection, null, SQLString, cmdParms);
            using (SqlDataAdapter da = new SqlDataAdapter(cmd))
            {
                DataSet ds = new DataSet();
                try
                {
                    da.Fill(ds, "ds");
                    cmd.Parameters.Clear();
                }
                catch (System.Data.SqlClient.SqlException ex)
                {
                    throw new Exception(ex.Message);
                }
                return ds;
            }
        }
    }

    /// <summary>
    /// 2012-2-21新增重载，执行查询语句，返回DataSet
    /// </summary>
    /// <param name="connection">SqlConnection对象</param>
    /// <param name="trans">SqlTransaction事务</param>
    /// <param name="SQLString">查询语句</param>
    /// <returns>DataSet</returns>
    public static DataSet Query(SqlConnection connection, SqlTransaction trans, string SQLString, params SqlParameter[] cmdParms)
    {
        SqlCommand cmd = new SqlCommand();
        PrepareCommand(cmd, connection, trans, SQLString, cmdParms);
        using (SqlDataAdapter da = new SqlDataAdapter(cmd))
        {
            DataSet ds = new DataSet();
            try
            {
                da.Fill(ds, "ds");
                cmd.Parameters.Clear();
            }
            catch (System.Data.SqlClient.SqlException ex)
            {
                trans.Rollback();
                throw new Exception(ex.Message);
            }
            return ds;
        }
    }


    private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, string cmdText, SqlParameter[] cmdParms)
    {
        if (conn.State != ConnectionState.Open)
            conn.Open();
        cmd.Connection = conn;
        cmd.CommandText = cmdText;
        if (trans != null)
            cmd.Transaction = trans;
        cmd.CommandType = CommandType.Text;//cmdType;
        if (cmdParms != null)
        {


            foreach (SqlParameter parameter in cmdParms)
            {
                if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
                    (parameter.Value == null))
                {
                    parameter.Value = DBNull.Value;
                }
                cmd.Parameters.Add(parameter);
            }
        }
    }

    #endregion

    #region 存储过程操作

    /// <summary>
    /// 执行存储过程，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
    /// </summary>
    /// <param name="storedProcName">存储过程名</param>
    /// <param name="parameters">存储过程参数</param>
    /// <returns>SqlDataReader</returns>
    public static SqlDataReader RunProcedure(string storedProcName, IDataParameter[] parameters)
    {
        SqlConnection connection = new SqlConnection(connectionString);
        SqlDataReader returnReader;
        connection.Open();
        SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
        command.CommandType = CommandType.StoredProcedure;
        returnReader = command.ExecuteReader(CommandBehavior.CloseConnection);
        return returnReader;

    }


    /// <summary>
    /// 执行存储过程
    /// </summary>
    /// <param name="storedProcName">存储过程名</param>
    /// <param name="parameters">存储过程参数</param>
    /// <param name="tableName">DataSet结果中的表名</param>
    /// <returns>DataSet</returns>
    public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName)
    {
        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            DataSet dataSet = new DataSet();
            connection.Open();
            SqlDataAdapter sqlDA = new SqlDataAdapter();
            sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
            sqlDA.Fill(dataSet, tableName);
            connection.Close();
            return dataSet;
        }
    }
    public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName, int Times)
    {
        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            DataSet dataSet = new DataSet();
            connection.Open();
            SqlDataAdapter sqlDA = new SqlDataAdapter();
            sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
            sqlDA.SelectCommand.CommandTimeout = Times;
            sqlDA.Fill(dataSet, tableName);
            connection.Close();
            return dataSet;
        }
    }


    /// <summary>
    /// 构建 SqlCommand 对象(用来返回一个结果集，而不是一个整数值)
    /// </summary>
    /// <param name="connection">数据库连接</param>
    /// <param name="storedProcName">存储过程名</param>
    /// <param name="parameters">存储过程参数</param>
    /// <returns>SqlCommand</returns>
    private static SqlCommand BuildQueryCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
    {
        SqlCommand command = new SqlCommand(storedProcName, connection);
        command.CommandType = CommandType.StoredProcedure;
        foreach (SqlParameter parameter in parameters)
        {
            if (parameter != null)
            {
                // 检查未分配值的输出参数,将其分配以DBNull.Value.
                if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
                    (parameter.Value == null))
                {
                    parameter.Value = DBNull.Value;
                }
                command.Parameters.Add(parameter);
            }
        }

        return command;
    }

    /// <summary>
    /// 执行存储过程，返回影响的行数		
    /// </summary>
    /// <param name="storedProcName">存储过程名</param>
    /// <param name="parameters">存储过程参数</param>
    /// <param name="rowsAffected">影响的行数</param>
    /// <returns></returns>
    public static int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected)
    {
        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            int result;
            connection.Open();
            SqlCommand command = BuildIntCommand(connection, storedProcName, parameters);
            rowsAffected = command.ExecuteNonQuery();
            result = (int)command.Parameters["ReturnValue"].Value;
            //Connection.Close();
            return result;
        }
    }

    /// <summary>
    /// 创建 SqlCommand 对象实例(用来返回一个整数值)	
    /// </summary>
    /// <param name="storedProcName">存储过程名</param>
    /// <param name="parameters">存储过程参数</param>
    /// <returns>SqlCommand 对象实例</returns>
    private static SqlCommand BuildIntCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
    {
        SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
        command.Parameters.Add(new SqlParameter("ReturnValue",
            SqlDbType.Int, 4, ParameterDirection.ReturnValue,
            false, 0, 0, string.Empty, DataRowVersion.Default, null));
        return command;
    }
    #endregion
}
